Device for firing explosives by electricity



A. DJIDICS DEVICE FOR FIRING EXPLOSIVBS BY ELECTRICITY Filed Nov. 21. 1924 nbonlio'c attoznu Paten A r.- 7', 1925.

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Application filed November 21, 1924. Seriallfo. 751,281.

To all whom it may concern: 1 Be it. known that AnnxANnrm DJroIos citizen of the United States, residing at Tamaqua, in the county of Schuylkill and State of Pennsylvania, has invented certain new and use Improvements in Devices for Firing Explosives by Electricity, of which the. followin is a specification. 's invention re ates to a device for fir ing explosives by electricity and it has for its object to provide an improved device of the cha acter of those commonly known as electrically fired matches. The device of the present invention isadapted to be used as a general purpose igniting device for explosives either with or without a detonator. It is a primary object of the invention to provide a device of the character indicated, characterized by extreme simplicity con- ;truction and consequent economy 1n manuacture:

V Further objects and advantages of the invention will be set forth'in the detailed description which follows:

In the accompanying drawings: Figure 1 is a side elevation of the mate of the present invention with the match com osition at the lower end thereof shown -part y insection and partly in elevation. Figure 2 is an end view of the match. Figure 3 is a lan view of the body tion of the mate with the current carrying wires omitted. I i

Figure 4 is a sectional view 4-4' of Figure 1. p

Figure 5 is' adetail view of the insulating base hereinafter described. v Figure 6 is a view substantially like Figure. 1 illustrating a, invention. 1

Figure 7 is a plan view of the structure illustrated in Figure 6 with the current carrying Wires omitted, and

Figure 8 is a sectional view upon line 8-8 of Figure 6.

upon line Like numerals designate corresponding parts in all of the figures of the drawing. Referring to Figures 1 to 5, and ularly to-F1gure 5, the numeral 5 designates a base plate of insulating material which may be made of fiber, heavy-paper or the like. 'Metal terminal plates .6 and 7 are clipped about the outer edges of the base 5, as illustrated in. Figure 3, and, m addiand 11 are soldered or otherwise secure por- -' clipped abo modified form of the.

artic- 'tion, their inner edges are crimped inwardly as indicated at 8, about the edges of the central opening 9 that is formed in the base 5. hus'these metal terminal plates are'firmly bound to the hase 5 but areheld .in spaced and insulated relation to each.

other. The current carrying, lead wiresi- 10 to 6 and 7. The lower edges. of the terminal plates are beveled or cut away as indicated at 12 to leave a s ace between them, which space is spanned b a bridge wire 13 of platinum, or any ot er suitable metal or alloy of metals.- The lower edges of the terminal plates are preferably notched out as indicated at'lifor the reception of the bridge 'wire. The space the respective plates between the cut away lower ends of the' terminal plates is filled with a match comosition, as indicated at 15, in which the rid e wire is embedded. W en current is supplied to the match in the usual and well known way, the bridge wire becomes incandescent and ignites the match composition and this in turn sets off any exploslve with which the match may be associated. Y

In the form of the invention illustrated in Figures 6 to 8, the structure is very similar to that illustrated in Figures 1 to 5. A base 5 'lik e that illustrated in Figure 5, is employed and the terminal plates 6, 7 are ut. the edes of the base 5 as illustrated in Figure In addition, portions of their inner edges are bent inwardly into engagement with the opposite edges of the central opening 9 of the base 5 in much the manner described with respect to Figure 1. Substantially the only difference between the structures of Figures land 6 is in the shape of the terminal plates and the extent to which they overlap the base.

It is to be understood .that' the invention is not limited to the precise construction fired match comprising an, i

' base and the inner edges of are engaged about the outer edges of the which are engaged with the edges of said openings. v

2. An electrically fired match comprising a fiat plate of insulating material constituting a'base, a pair of metallic lates, the

outer edges of which are engage about the outer edges of the base and the inner edges of which are engaged with the edges of an opening formed through said base.

3. A structure as recited in' claim 3, in combination with a bridge wire spannin the space at the lower ends of said termina plates and a body of match composition in which said wire is embedded.

4. A structure as recited in claim 3 in combination with a bridge wire gexten g between the lower ends of said plates and connected thereto. 6

5. A' structure as recited in claim 3, wherein the lower ends of said lates are cut away at an angle to space t eir outer.

lower corners a material distance from each ALEXANDER DJIDICS. Witnesses R. L. HILL, A. F. Knur. 

